Absorbent article printed using digital printing technology and a method of printing
A strip of absorbent material capable of being divided into a plurality of absorbent articles is disclosed. Each of the absorbent articles has a first major surface and at least one distinct image printed on the first major surface using digital printing technology. The distinct image printed on one of the absorbent articles is positioned at a different location relative to the distinct image printed on an adjacent absorbent article. A method of printing at least distinct image on a first major surface of a strip of absorbent material using digital printing technology is also disclosed.
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Today, processes used to print images and text on folded and rolled absorbent articles, such as facial tissue, bath tissue, paper towel, wipes, etc., are very limited. The use of printing plates and plate rolls restricts the number of images that can be printed on the finished article, as well as the distance between repeating images. The fixed length of a printing plate and the fixed diameter of a plate roll create a predetermined image repeat length. In addition, a printing plate does not allow the printing system to offer a multitude of distinct images. In order to change images, one must replace the printing plate or plate roll with another plate or roll, respectively, having different images. This change requires shutting down the equipment, substituting one plate or roll for another and making a number of mechanical adjustments. Furthermore, the current printing processes do not allow the distinct images to be varied in size, location and registration as the pattern is repeated.
Digital printing is a relatively new technology that may be utilized in printing variable images on folded and rolled absorbent articles. Digital printing provides flexibility in image size and selection and also allows adjustability of the image registration on the finished article in both the machine and cross directions. Digital printing may also provide the opportunity to offer next generation printed absorbent articles in a cost effective and efficient manner.
Currently, manufacturers of facial tissue, bath tissue, paper towels, wipes, etc. have a strong desire to be able to sell a package of folded or rolled absorbent articles, wherein each article or sheet has a different image printed on it. Manufacturers would also like to offer such printed absorbent articles in multiple color images in a cost effective and timely manner.
Now, absorbent articles can be printed with distinct images using digital technology such that the size, position, location and registration of each adjacent image can be varied. In addition, all of the images can be distinct and a repeating pattern can be established for every n absorbent article contained within a package. Alternatively, a non-repeating pattern of images can be utilized.
SUMMARY OF THE INVENTIONBriefly, this invention relates to a strip of absorbent material capable of being divided into a plurality of absorbent articles. Each of the absorbent articles has a first major surface and at least one distinct image printed on the first major surface using digital printing technology. The distinct image printed on one of the absorbent articles being positioned at a different location relative to the distinct image printed on an adjacent absorbent article.
A method of printing at least one distinct image on a first major surface of a strip of absorbent material that is capable of being divided into a plurality of absorbent articles, using digital printing technology, is also disclosed.
BRIEF DESCRIPTION OF THE DRAWINGS
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The strip of absorbent material 10 can be formed from natural and/or synthetic fibers. Desirably, the absorbent material 10 can be made from cellulosic fibers, textile fibers, from wood pulp, from a combination of fibers and pulp, or from any other absorbent materials known to those skilled in the art. Synthetic fibers, such as thermoplastic fibers formed from polypropylene or polyethylene can also be used. When synthetic fibers are utilized, they most likely will have to be chemically coated or treated to make them hydrophilic. By “hydrophilic” it is meant that the material has an affinity for absorbing a liquid or a fluid. It is also possible to mix cellulosic fibers with synthetic fibers to form a durable absorbent material. Furthermore, a superabsorbent can be added to the cellulosic fibers to increase the absorbent capacity of the absorbent articles. A superabsorbent is a material having a high capacity for absorbing and retaining a liquid or a fluid. Superabsorbents are commonly employed in solid form and can vary in shape. Typically, small particles, granules, flakes, etc. are utilized. If one wishes to incorporate a superabsorbent, it can be mixed, combined, attached, printed or otherwise added to the strip of absorbent material 10.
The strip of absorbent material 10, shown in
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The absorbent article 12 can be almost any type of absorbent product that is manufactured as an individual article, such as a sheet, or as a plurality of articles temporarily connected together, such as a roll of toilet paper connected by lines of perforations. Examples of individual absorbent articles include but are not limited to facial tissue, paper napkins, dry wipes, wet wipes, industrial wipers, etc. Examples of absorbent articles formed as a roll include but are not limited to a roll of bath tissue, commonly referred to as a roll of toilet paper, a roll of paper towels, a roll of wipes, etc. Furthermore, the absorbent article 12 can have a flat appearance or it can be folded, creased, corrugated or configured to have a topographical profile or a non-planar configuration.
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The strip of absorbent material 10 can be printed before it is wound up into a cylindrical roll (not shown) or it can be printed after it has been unwound from a supply roll. The exact point in the process where the strip of absorbent material 10 is printed does not matter so long as the strip of material 10 is sufficiently dry and can soak up the ink that is applied to it and sufficient time is provided to allow the ink to dry.
The image 20 should be printed on at least one of the first or second major surfaces, 14 and 16 respectively, of the absorbent article 12. Each image 20 should be clearly visible on the first major surface 14. For some absorbent articles, it may be desirous to have the image 20 be clearly visible on both of the first and second major surfaces, 14 and 16 respectively. This can be accomplished by printing the image 20 on both of the first and second major surfaces, 14 and 16 respectively, or printing the image 20 on one surface and allowing the ink to penetrate through to the opposite surface.
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It should be noted that the package 44 can be formed from almost any kind of material known to those skilled in the art. Such materials include but are not limited to paper, cardboard, plastics, thermoplastics films such as polypropylene or polyethylene, laminates of paper and plastic, or any combination thereof. The package 44 can also be formed from other traditional materials such as wood, ferrous and non-ferrous metals, glass, etc.
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The database 54 can be stored in a computer, on a disk or on an independent server that is electronically connected to one or more computers.
Alternatively, the database 54 can be located on the hard drive of a computer. One or more of the images 52 can be selected by a person who operates the computer. The information imputed into the computer will be electronically conveyed to a controller 56. The controller 56 can itself be a computer, microprocessor or some other type of programmable logic unit known to those skilled in the art. The controller 56 is, in turn, electronically connected to a print station 58. The print station 58 can also be a computer which selects an ink composition, the required colors, etc. The print station 58 controls a print head 60 such that the preselected images 52 can be created and printed onto the strip of absorbent material 62. The printed images 52 will be printed at a desired position or location, in a desired size, in a predetermined color(s) and at a registration such that any image 52 will be correctly present on any of the absorbent articles 64.
The print station 58 and the print head 60 are normally part of the ink jet printing system. An ink jet printer typically includes an ink jet print head that has a plurality of orifices (not shown). An ink composition made according to preselected criteria may be expelled from one or more of the orifices thus exiting the print head 60. Drops of the ink composition then travel a throw distance between the print head 60 and the moving strip of absorbent material 62. The orifices of the print head 60 may be aligned in a single row or may be formed having various patterns. The ink composition may be expelled from the orifices either simultaneously or through selected orifices at any given time. For many applications, the throw distance from the print head 60 to the surface of the strip of absorbent material 62 onto which the ink composition is applied is typically less than about 15 millimeters(mm), and commonly is less than about 5 mm.
According to the present invention, any suitable ink jet printing device can be used for applying ink compositions to the strip of absorbent material 62.
An ink jet printer is a non-impact printer that does not physically touch the strip of absorbent material 62. The ink composition to be applied to the strip of absorbent material 62 is in the form of discrete droplets. The size of the droplets can be varied as desired. Furthermore, placement of the droplets on the strip of absorbent material 62 can be precisely controlled using the controller 56. Because the ink jet printers do not contact the strip of absorbent material 62, the non-impact printers limit the spread of the ink composition once applied in the x, y and z directions and allow for the fine and discrete drops to remain intact on the strip of absorbent material 62. Drop size and the pattern used to apply the ink composition can be varied to allow for optimal sensory properties on the strip of absorbent material 62, such as softness, while still allowing for absorbency. Furthermore, non-impact printers can also be adjusted in order to control the amount of surface penetration that occurs when the ink composition contacts the strip of absorbent material 62. For example, in some applications, it is desired for the ink composition being applied to the strip of absorbent material 62 to remain on the surface and not migrate into the interior portions of the strip of absorbent material 62.
It should be noted that the ink composition can be altered to include additives that a manufacturer may wish to add to his absorbent articles 64. For instance, the additives can be a topical preparation that improves the physical properties of the strip of absorbent material 62. The additives can also be an anti- bacterial agent, a medicinal compound, an anti-acne agent, an anti-microbial agent, an anti-fungal agent, an antiseptic, an antioxidant, a softener, a cosmetic astringent, a drug astringent, an aiological agent, an emollient, an external analgesic, a humectant, a moisturizing agent, a skin conditioning agent, a skin exfoliating agent, a sunscreen, as well as mixtures thereof. These and other additives known to those skilled in the art can be utilized in varying amounts. For example, a bath tissue manufacturer may wish to add a softener, such as polysiloxane, to make his tissue feel softer to the touch.
Lastly, it should be noted that a plurality of absorbent articles 12 can be enclosed or contained in a package or some other type of product offering prior to being shipped to a retailer for sale. A product offering can be a closed or partially closed package or container. For example, an arrangement of absorbent articles 12 in a basket or on a tray will qualify as a product offering. The absorbent articles 12 can be formed into a roll, such as a roll of bath tissue or a roll of paper towels, or they can be folded, stacked, sorted or somehow arranged into one or more stacks, piles or bundles, such as facial tissue, wet wipes or individual towels, before they are packaged. It is also possible to position one or more different kinds of absorbent articles 12 into a single package or product offering, if desired.
MethodThe method of printing at least one distinct image on a first major surface of a strip of absorbent material is also disclosed. The method includes printing the at least one distinct image using digital printing technology. In addition, the strip of absorbent material is capable of being divided into a plurality of absorbent articles. This will allow the images to fully appear on each individual absorbent article or extend between one or more adjacent absorbent articles. For example, a single image could extend or cover two, three or more individual absorbent articles that are situated adjacent to one another.
While the invention has been described in conjunction with several specific embodiments, it is to be understood that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the aforegoing description. Accordingly, this invention is intended to embrace all such alternatives, modifications and variations that fall within the spirit and scope of the appended claims.
Claims
1. A strip of absorbent material capable of being divided into a plurality of absorbent articles, each of said absorbent articles having a first major surface and at least one distinct image printed on said first major surface using digital printing technology.
2. The strip of absorbent material of claim 1 wherein said digital printing technology includes an ink jet printer connected to a computer having access to a database containing a variety of distinct images.
3. The strip of absorbent material of claim 1 wherein said distinct image printed on one of said absorbent articles is of a different size relative to said distinct image printed on an adjacent absorbent article.
4. The strip of absorbent material of claim 1 wherein said distinct image printed on one of said absorbent articles has a machine and cross direction registration which is different relative to said machine and cross direction registration of said distinct image printed on an adjacent absorbent article.
5. The strip of absorbent material of claim 1 wherein each of said absorbent articles is a folded sheet of facial tissue.
6. The strip of absorbent material of claim 1 wherein said absorbent articles are connected together by lines of perforations.
7. The strip of absorbent material of claim 6 wherein each of said connected absorbent articles is a bath tissue.
8. The strip of absorbent material of claim 6 wherein each of said absorbent articles is a paper towel.
9. The strip of absorbent material of claim 7 wherein said distinct image printed on one of said bath tissues is in registration with a distinct image printed on an adjacent bath tissue but is of a different size.
10. A strip of absorbent material capable of being divided into a plurality of absorbent articles, each of said absorbent articles having a first major surface, a second major surface, and at least one distinct image printed thereon using digital printing technology, said digital printing technology including an ink jet printer connected to a computer having access to a database containing a variety of distinct images, said distinct images being clearly visible on said first major surface, and said distinct image printed on one of said absorbent articles having a machine and cross direction registration which is different from a machine and cross direction registration of said distinct image printed on an adjacent absorbent article.
11. The strip of absorbent material of claim 10 wherein each of said distinct images is clearly visible on each of said first and second major surfaces.
12. The strip of absorbent material of claim 10 wherein each of said absorbent articles is a sheet of bath tissue connected together by a line of perforations and each of said distinct images is printed across one of said lines of perforations.
13. The strip of absorbent material of claim 10 wherein each of said absorbent articles is a sheet of bath tissue connected together by a line of perforations and each of said distinct images is spaced apart from said lines of perforations.
14. The strip of absorbent material of claim 10 wherein each of said absorbent articles has more than one image printed thereon.
15. The strip of absorbent material of claim 10 wherein each of said absorbent articles has only a partial image printed thereon.
16. A strip of absorbent material capable of being divided into a plurality of absorbent articles, said absorbent articles being contained in a package, each of said absorbent articles having a first major surface and at least one distinct image printed on said first major surface using digital printing technology, and said distinct image printed on one of said absorbent articles being of a different size relative to said distinct image printed on an adjacent absorbent article
17. The strip of absorbent material of claim 16 wherein each of said distinct images contains at least one color.
18. The strip of absorbent material of claim 17 wherein each of said distinct images contains at least two different colors.
19. The strip of absorbent material of claim 16 wherein each of said absorbent articles is a folded tissue sheet.
20. The strip of absorbent material of claim 16 wherein each of said absorbent articles is a bath tissue which is connected together by a line of perforations.
21. A method of printing at least one distinct image on a first major surface of a strip of absorbent material that is capable of being divided into a plurality of absorbent articles, said image being printed using digital printing technology.
Type: Application
Filed: Apr 11, 2006
Publication Date: Oct 11, 2007
Applicant:
Inventors: Christopher Wilson (Appleton, WI), Andrew Bakken (Appleton, WI)
Application Number: 11/401,827
International Classification: B41M 5/00 (20060101); A61F 13/15 (20060101);